WO2017148684A1

WO2017148684A1 - Self-piercing rivet die

Info

Publication number: WO2017148684A1
Application number: PCT/EP2017/053004
Authority: WO
Inventors: Dennis Henke; Daniel Junklewitz; Andreas Marxkors; Franz-Ferdinand Menne
Original assignee: Böllhoff Verbindungstechnik GmbH
Priority date: 2016-03-04
Filing date: 2017-02-10
Publication date: 2017-09-08
Also published as: US10632523B2; US20190084032A1; CN109311074A; CN109311074B; KR20180110072A; EP3423211A1; EP3423211B1; JP2019511365A; JP6692915B2; DE102016103999A1; KR102096819B1

Abstract

The present invention describes a self-piercing rivet die for a rivet gun, by which die a self-piercing rivet connection can be produced in a plurality of components by formation of a closing head. This self-piercing rivet die (1) is characterised by a main body (3) with a top face (8) and a recess (9) which is formed thereon and is arranged rotationally symmetrically relative to a central axis M of the self-piercing rivet die 1. In the cross-section of the self-piercing rivet die (1) the recess (9) has a draft angle (12) of the draft section (10) which merges radially via a step (16) into an arcuate depression (22) of the annular channel section (20), wherein radially inwards the arcuate depression (22) rises in a rectilinear or arcuate or curvilinear manner to the die base (30).

Description

Stanznietmatrize

1 . Field of the invention

The present invention relates to a punch rivet die for setting a punch rivet into at least a first and a second component, a setting tool in combination with this punch rivet, the connection made by means of this punch rivet die between at least two components and a method for producing such a connection. 2. Background of the invention

In the prior art, the joining of at least one first and one second component by means of a punch rivet is known. For this purpose, a punch rivet is driven into the at least two components by means of a setting device, wherein the at least two components are supported on a die arranged opposite the punch. Due to its shape, this matrix has an effect on the properties of the joint.

For example, DE 199 05 528 B4 discloses an anvil die. This anvil matrix is characterized by a flat surface, which serves the counter bearing to support the components to be joined together. Such a trained matrix provides an aesthetically pleasing

Surface at the side of the joint connection facing away from the punch rivet. This is particularly advantageous with visible punch rivet connections. A disadvantage, however, is that the displaced by the punch rivet material of the components can not escape into a Matrizenhohlraum. As a result, the punch rivet is compressed and expanded more than the conventional punch rivet. This loads the material of the components and thus the entire joint connection. In addition, the flat anvil die ensures greater spreading of the punch rivet, which leads to higher compressive stresses in the material of the components. These additional compressive stresses can shorten the life of the compound produced.

DE 10 2009 039 936 A1 uses a die for producing a punched-rivet joint, which shows a square die cavity with a central depression. Especially the angular design of this punch rivet matrix ensures a non-uniform Materia! flow during the setting process. This leads to an uncoordinated material distribution within the Matrizenhohlraums. As a consequence, the die cavity is filled unevenly with material of the die-side component, so that the formed closing head does not uniformly surround the spread-out rivet shank. EP 1 078 701 A2 and EP 2 606 993 B1 propose a stamped rivet die with a spherical segment-shaped recess for producing a reliable butted rivet joint. This punch rivet is suitable for more ductile materials, such as aluminum, up to a sheet thickness of 1, 5 mm. Even if the uniformly shaped ball-shaped recess supports a uniform flow of material during the setting process, a lack of spreading of the punch rivet and a possible compression of the punch rivet was found. These operations affect the life of the compound produced.

In vehicle construction, more and more magnesium and aluminum components are used. These contribute due to their reduced weight, for example, compared to steel materials, to a reduction of the vehicle weight and thus the fuel consumption. However, connections are made between components made of these materials, such as components

7000 series aluminum, these compounds are often affected by negative cracking. DE 1 1 2012 003 904 T5 therefore proposes a suitable heat treatment for stamped metal compounds in such materials. Although the heat treatment described here can reduce the formation of cracks, it also increases the expense of producing such compounds. Therefore, it is an object of the present invention to propose a suitably designed Stanznietmatrize, even in the

Making a riveted joint in brittle materials such as 7000 series aluminum or aluminum alloys eliminates the need for additional thennical treatment.

A likewise complicated process for producing a stamped rivet connection is described by DE 44 04 659 A1. Here, the essential objective is to produce a liquid-tight Stanznietverbindung between two components. It should therefore be avoided that the punch rivet to be set produces negative crack growth in the components. For this reason, the production of the stamped rivet connection is prepared by preforming the two components to be joined together into a shape complementary to the punch rivet. This object is achieved by means of a punch which engages a punch rivet die whose die cavity is formed by an annular groove for the rivet shank and a central boss for the cavity in the rivet shank. In this way, the spreading of the Halbhohlst rivet is reduced during the setting process. In addition, the load on the punch-side component is reduced by the punch rivet, so that it does not cut through the sheet metal layer facing the punch during the setting process. In this way, the actual punch riveting process is limited by the depth of the die adapted to the length of the punch rivet. Because the sufficiently large die cavity adapted to the punch rivet does not counteract the punch rivet with sufficiently large counterforce, which leads to compression of the punch rivet and formation of a sufficient undercut. WO 2014/009129 A1 describes a punch rivet die which uses an annular material flow block in the die cavity. This annular material flow blockage is intended to prevent the material of the die-side component from flowing radially outwardly once it has been pressed against the bottom of the die cavity. In this way, it should be ensured that a sufficient material residue thickness is present below the punch rivet after the connection has been established. In addition, the material accumulation within the material flow blockage should ensure that the material force counteracting the rivet shank ensures sufficient spreading of the rivet shank. Since the material flow during the joining process is hindered both by the annular material flow blockage as well as by the almost vertically rising side walls of the die, there is only an uneven distribution of material in the die cavity. This also aids in uneven realization of bonding forces within the rivet joint to be made. Also, providing a central depression within the die cavity will only marginally improve material flow during the production of the punched rivet joint. For it is precisely when this depression is used in combination with the annular material flow blockage that a kind of shielding of the radially outer cavity of the mold is initially created, until the volume of the central depression and the annular material flow blockage has been filled by displaced material of the component facing the die. Only then does material flow into the remainder of the die cavity. This step-like design of the closing head within the Matrizenhohlraum requires just in brittle materials a sufficiently large filling volume for the Matrizenhohlraum. This is often not given, resulting in a weakening of the manufactured

Punch rivet connection leads.

EP 1 294 504 B1 describes a punch rivet die in which excess material can flow out of the die cavity. This is realized, for example, in that an opening to the die cavity allows the component material to flow away. The repressed in this way repressed

Component material prevents a material jam in the die cavity from collapsing the set punch rivet. At the same time it is also prevented by the discharged material in the absence of precise matching to the Matrizenhohlraum that sufficient back pressure of the displaced material leads to reliable spreading and thus permanent connection between the two components. It is therefore the object of the present invention to provide a punch rivet die which overcomes existing disadvantages in the prior art and makes a reliable stamped metal connection with a long service life. In addition, it is a further object of the present invention to propose a corresponding punch rivet connection, a setting tool with such a punch rivet die and a method for producing such a connection. 3. Summary of the invention

The above object is achieved by a punch rivet die according to independent claims 1 and 10, by a setting tool according to independent claim 12, by a connection according to independent claim 13 and by a punch riveting method according to independent patent claim 15. Further advantageous embodiments and further developments of the present invention will become apparent from the following description, the accompanying drawings and the appended claims.

The punch rivet die according to the invention for a setting tool with which a stamped rivet connection can be produced in a plurality of components to form a closing head, has the following features: a base body, preferably a cylindrical base body, with an upper side and a rotationally symmetrical design to a center axis of the punch rivet die arranged recess having a diameter DM at the top, the recess comprises a radially outer annular demolding section, an adjoining Ringkanalab- section and a centrally disposed die bottom, wherein in a direction parallel to the central axis cross-section of the Stanznietmatrize a Entformungsschräge of the demolding the top of the punch rivet die an angle ^< in the range of 5 ° <oc <45 °, the Entungsungsschräge radially inwardly over a step in a circular arc-shaped countersinking of the ring Channel section with a radius Rs in a range of 8.2 / 1000 D <Rs <8.2 / 100 DM and radially inwardly the arcuate reduction increases rectilinear or circular arc to Matri / .cnbodcn.

The above-described shape of the punch rivet die positively influences the material flow of the die-side component during the setting process in order to form a suitable closing head for the joining connection. At the same time, the predetermined shape of the punch rivet matrix ensures a defined spreading of the punch rivet and a reduction of the mechanical stresses in the rivet base. This is achieved in particular by the fact that the annular channel section provides material-receiving spaces for relieving the rivet foot area. In addition, smooth transitions between the annular channel section and the annular demolding section provide for a uniform flow of material that promotes reliable closure copy formation.

According to a first preferred embodiment of the punch rivet die according to the invention, the draft angle is rectilinear. According to a further preferred embodiment, the Entformungsschräge has a concave-circular arc shape with a radius RES in the range of 7/10 DM <RE _S 9/10 D. Due to the above-mentioned even and barrier-free transition between the annular demolding and the subsequent annular channel section, the deformed in the recess of the Stanznietmatrize material is not just jammed. This material of the die-side component can move into the free spaces provided, so that the Punch rivet is spread evenly during the setting process. According to another preferred embodiment of the present invention, the arcuate countersinking of the punch rivet die has a maximum depth TRK relative to the top of the punch rivet die in the range of 6/100 DM <TRK <12/100 DM. Depending on the material of the die-side component, the depth of the reduction in the annular gap section is variably adjustable. In this way, a specific material behavior, such as, for example, brittle materials, can be addressed in a targeted manner in order to prevent crack formation in the material

To avoid closing head. Preferred materials according to the invention are brittle materials which have a breaking elongation of less than 15%. Such materials include, for example, magnesium die-cast alloys, high-tempered steels with a strength greater than 900 MPa, or aluminum-copper 1.cgi eruns of the 200 series, and aluminum-zinc! alloys of the 7000 series, just to name a few examples.

Furthermore, preferably, the inturning slope transitions in a convex step into the countersinking of the annular channel section. It is also preferred according to the invention that the reduction of the annular channel section also merges into the matrix base in a convex step. It has been shown that just the

Avoidance of angular transitions supports the material flow within the recess of the punched rivet die. Therefore, curvilinear shaped transitions provide the preferred connection between the drafting slope and the counterbore and between the countersink and the die bottom. In this way it is also avoided that a material flow on, for example, an edge between the draft angle and the countersinking blocks the material flow, which could lead to an unpredictable compression of the punch rivet during the joining process.

According to a further preferred embodiment of the punch rivet die according to the invention, the circular arc-shaped countersinking transitions tangentially into the adjacent convex steps in two adjacent transfer points. By a radial distance OP between the adjacent transition points, a width of the circular arc-shaped countersinking of the annular channel section is defined. This width of the circular-arc countersinking is preferably in the range of 3/100 DM <AUP <20/100 DM. It is also clear from the above definition that according to the invention the depression of the punch rivet die is preferably defined by a steadily uniform wall course. In this case, in addition to the depth of the reduction of the annular channel portion also the width of the reduction of the annular channel portion to the respective choice of material of the die-side component can be adapted. Accordingly, the volume which can be accommodated by the depression of the punch rivet die is designed in a targeted manner, taking into account the material properties of at least the die-side component. According to a further preferred embodiment of the present invention, the die bottom comprises a central recess with a depth TA in the range of 2/100 DM <TA <8/100 DM and with a preferred diameter DA in the range of 15/100 DM <D _A <35/100 DM. This preferred embodiment of the matrix base represents a further possibility to specifically adapt the material volume of the matrix-side material to be accommodated in the depression of the punch rivet die. Furthermore, the shaping of the central recess in the die base also influences the flow behavior of the material and thus the formation of the closing head.

According to different preferred embodiments of the present invention, the inner contour or the inner shape of the central recess is formed differently. According to a first alternative, the central recess is cylindrical. Another preferred embodiment recommends to equip the central recess with a central elevation or a conically tapering additional depression. It is further preferred to design the bottom of the central recess with an additional annular gap which includes an arcuate elevation or a semi-elliptical elevation. According to a further preferred embodiment of the central recess, it runs conically in the depth direction.

The present invention additionally comprises a punch rivet die for a setting tool, with which a punched rivet connection can be produced in a plurality of components to form a closing head. This stamped rivet die has the following features: a base body, preferably a cylindrical base body, with an upper side and a recess arranged rotationally symmetrical about a central axis of the punch rivet die, which has a diameter DM at the upper side, the recess comprising a radially outer annular Entformungsabschnitt, an adjoining annular channel section and a centrally disposed Matrizenboden, wherein in a parallel to the central axis cross-section of the Stanznietmatrize a Entformungs- oblique demolding section with the top of the Stanznietmatrize an angle o in the range of 10 ° <oc <85 °, the Ent formation bevel merges radially inwardly into a circular arc-shaped reduction of the annular channel portion with a radius Rs in a range of 8.2 / 1000 DM <Rs <8.2 / 100 DM and radially inwardly the arcuate reduction over at least one e First step rises in a circular arc to Matrizenboden. It has been shown that it is precisely with this preferred embodiment of the present invention that the spreading behavior of a semi-hollow punch rivet can be influenced to produce an increased undercut. In this case, the Nietfuß radially outwardly by means of the combination of annular gap portion and die bottom advantageously radially outwardly ver formed. In this context, it is erfmdungsgemäß preferred that the die bottom has a centrally arranged rotationally symmetrical elevation, the curvilinear, circular arc, semi-elliptical or is cylindrical. This centrally arranged rotationally symmetrical elevation preferably ensures according to the invention the required material accumulation, with the aid of which the rivet foot is deformed radially outward to form a suitable undercut.

The present invention also includes a setting tool with a punch rivet die according to one of the above-described preferred embodiments of the present invention. Furthermore, present invention includes

The invention relates to a combination of at least a first component and a second component which has been produced by means of a punch rivet and the punch rivet described above, so that a closing head characterizing the connection has complementary shape features with respect to the punch rivet die. According to a further preferred embodiment of the present invention, the second component adjacent to the closing head consists of a sensitive or brittle material, preferably a 7000 aluminum alloy.

The present invention also discloses a punch rivet method for making a joint in at least a first and a second component by means of a punch rivet, a setting tool and a punch rivet die according to one of the embodiments described above. The punch riveting method has the following steps. Providing the punch rivet die beneath a punch of the setting tool, disposing the first and second components between the punch rivet die and the punch, and setting a punch rivet into the first and second components while forming a closing head having shape features complementary to an inner contour of the punch rivet die.

4. Brief description of the accompanying drawings

The preferred embodiments of the present invention will be explained in detail with reference to the accompanying drawings. Show it:

1 is a side view of a preferred punch rivet of the present invention.

Fig. 2 is a view of the preferred Stanznietmatrize of FIG. 1 from above in the joining direction in the

Deepening of the punch rivet die.

3 shows a schematic lateral sectional view of the depression of the punch rivet die preferred according to the invention parallel to the center axis of the punch rivet die, the depression having a ring channel section and a planar die bottom,

4 shows a further schematic representation of the preferred punch rivet die according to FIG. 3, in which different depths of the annular channel section are indicated, 5 shows a further preferred embodiment of the punch rivet die according to the invention in a lateral cross-sectional view,

Fig. 6 is a plan view of another preferred embodiment of the invention

Stanznietmatrize,

Fig. 7 is a side cross-sectional view of the preferred recess of the punch rivet according to

6, 8 a schematic representation of a further preferred embodiment of the recess of the punch rivet die according to the invention with an additional recess in the die base,

9 shows the schematic illustration of the further preferred punch rivet die according to FIG. 8, in which different preferred depths of the annular channel section and of the central recess in the die base are indicated, FIG.

10 shows a further schematic representation of the preferred punch rivet die according to FIG. 8, in which different preferred embodiments of the central recess in the matrix base are schematically illustrated, FIG.

Fi. 1 1 is a plan view of a further preferred embodiment of the recess of the punch rivet die according to the invention, FIG. 12 is a side sectional view of the recess of the preferred punch rivet according to FIG.

11, a top view of a further preferred embodiment of the recess of the punch rivet die according to the invention,

Fig. 14 is a side sectional view of the recess of the preferred Stanznietmatrize according to

Fig. 13,

15 is a schematic representation of another preferred punch rivet die,

16 shows a setting tool according to DE 10 2009 049 616 with the preferred punch rivet die, Fig. 17 ad micrographs and closing heads of inventively preferred compounds

18, a micrograph of a preferred connection made with the punch rivet according to FIG

Fig. 8 and

19 is a flow chart of a preferred embodiment of the method for producing a connection according to the invention using the punch rivet die. 5. Detailed Description of the Preferred Embodiments

FIG. 1 shows a side view of a punch rivet die 1 which is preferred according to the invention. This preferably consists of a cylindrically shaped Grandkörper 3 and a Matrizenfuß 5. In this context, it is also preferred to design the Grandkörper cuboid, polyhedral, elliptical or with another shape. The Matrizenfuß 5 is used in a known manner, the arrangement and the attachment of the punch rivet 1 in a known setting tool, as shown by way of example in Fig. 16. It is understood that the present punch rivet is combinable with known setting tools of any type. For this purpose, the die base 5 preferably has a round cross-section. This is disturbed on one side by a notch 7 in its symmetrical contour in order to arrange the punch rivet 1 against rotation in a suitable holder can.

FIG. 2 shows the preferred stamped rivet die 1 of FIG. 1 in a plan view. This top view corresponds to a view of the punch rivet die 1 in the joining direction F, which runs parallel to the center axis M of the punch rivet die 1. The main body 3 comprises a preferably rotationally symmetrical about the central axis M arranged recess 9, which is arranged in the upper side 8 of the main body 3. At the top 8, the recess 9 has a diameter DM.

The recess 9 is rotationally symmetric divided into different sections. On the upper side 8, ie the side of the punch rivet die 1 facing a punch of the setting tool, the depression 9 begins with an annular removal section 10 arranged radially on the outside. The removal cut-off 10 is in the axial cross section of the punch rivet die 1 according to FIG. 5 on the basis of the radially outwardly disposed draft slope 12 recognizable. Preferably, the upper side 8 merges into the demoulding slope 12 in a convexly shaped section. According to a preferred embodiment, the radius ROE (see FIG. 3) for the transition from the upper side 8 into the drafting slope 12 is equal to 4/100 DM radially inward and closes at the demapping section 10 to an annular channel 20. This can be seen in the cross-section of the punch rivet die 1 in FIG. 5 as an arcuate countersink 22. The reduction 22 preferably transitions radially inwardly with a straight and / or arcuate and / or curvilinear region into a die base 30. This die bottom 30 is likewise arranged rotationally symmetrical about the central axis M and can be seen in FIG. 5 as a flat surface 32. In a joining method which is preferred according to the invention, a known setting tool (see FIG. 16) in combination with the described punching rivet die 1; (see below) used to make a riveted joint and provided accordingly (step 1). In order to connect a plurality of components, in particular at least a first and a second component, by setting a punch rivet, the at least two components between punch and punch rivet die 1; Γ positioned (step 2). In this case, the punch rivet die 1 according to the invention is preferably used in combination with a die-side component made of brittle or resilient material, such as, for example, aluminum alloys of the 7000 series, aluminum die cast materials or magnesium. Furthermore, a material with a modulus of elasticity RM <300 MPa, such as aluminum, for example, or with a modulus of elasticity M <1 500 MPa, such as, for example, high-tempered steel, can also be advantageously used for the die-side component. In principle, any material, preferably plastics, reinforced plastics, aluminum, magnesium, alloys of these metals-that is, generally light building materials-as well as steel and other known metal alloys is suitable as a stamp soapy component, ie a cover layer of the compound. After the components have been suitably arranged between punch and punch rivet die 1, the punch sets the punch rivet into the components, whereby a closing head characterizing this connection is formed in the punch rivet die 1 (step 3). The closing head preferably represents an imprint of the inner configuration of the depression 9 of the punch rivet die 1. The closing head is correspondingly characterized by the shape features formed complementary to the inner contour of the depression 9.

During setting of the punch rivet into the components and the formation of the casting head, the draft bar 12 of the annular mold removal section 10 preferably effects a reduction of cracking in the closing head. To support this effect is preferably the top 8 of the

Punch rivet 1 in a convex stage 14 in the Entformungsschräge 12 via. In the same way, it is preferable to connect the Entformungsschräge 12 via a convex step 16 with the countersink 22 and the annular channel portion 20. Preferably, this convex-shaped connection between Entformungsschräge 12 and the counterbore 22 has a radius of about 5/100 D. Further preferably, the Entformungsschräge 12 is straight compared to the concave configuration shown in Figure 5. Accordingly, the Entformungsschräge 12 and thus the annular demolding section 10 has a kegeistumpfartige contour. In a preferred concave / circular-arc configuration of the draft angle 12, a radius RES from the range 7/10 D _M <RES <9/10 D _M has in this area. FIG. 3 shows a schematic and simplified cross-sectional view of the punch rivet die 1 with demoulding section 10, annular channel section 20 and die bottom 30. FIG. 4 shows, based on the illustration in FIG. 3, that a depth TRK of the annular channel section 20 in FIG Reference to the top 8 is targeted. The different dashed lines in the counterbore 22 illustrate the variation of the depth TRK in a preferred range of 6/100 DM <T _RK <12/100 DM, where D _M denotes the diameter of the recess 9 at the top 8 of the base body 3. By the preferred targeted adjustment of the depth TRK of the annular channel 20 and the reduction 22 just in the preferred combination with the Entfonnungsschräge 12, the rivet foot during the joining process stressing mechanical stresses are reduced. As a further advantage, it has been recognized that the annular channel section 20 directs the flow of the material of the die-side component radially outward. Exactly this material flow realizes or supports a defined and controlled spreading of the punch rivet in the punch rivet die 1. Thus, by the inventively preferred combination and Formgebun the shallow Entformungsschräge 12 and the reduction 22 of the annular channel portion 20 with the depth TRK the spreading of the punch rivet and the flow of material to form the closing head optimized. Because due to the additionally created by the preferred annular channel 20 clearance within the recess 9 of the Stanznietmatrize 1 of the punch rivet at the beginning of the flow of material in the recess 9, although a counterforce through the die bottom 30. This can but immediately by using the radially outer free space of the annular channel 20 are reduced, so that the radially outwardly directed Materialfließbewegung is selectively initiated by the preferred die design. This is preferably also supported by the fact that the die bottom is above the lowest point of the countersink 22.

For this purpose, the depression 22 of the annular channel section 20 preferably has a radius Rs in the range of 8.2 / 1000 DM <Rs <8.2 / 100 D _M. In this case, DM denotes the diameter of the recess 9 (see above).

The Entfonnungsschräge 12 preferably includes with the top 8 of the main body 3 the angle «, as shown in Figures 3 and 5. This has in accordance with the radially inwardly directed inclination of Entfonnungsschräge 12 has a size in the range of 5 ° <o <45 °, preferably 25 ° <oc <45 ° or 5 ° <oc <25 °. In addition, the angle oc = 18 ° has been preferred according to the invention. Just by this flat arrangement of Entformungsschräge 12, which causes a significantly different Materialflie- Shen in the recess 9 as a vertical or approximately perpendicular side wall of the recess 9, an improved closing head formation and a reduced cracking in Achieved compared to the prior art. In this context, it is also preferable to realize a convex transition between the upper side of the die and Entungsungsschräge with a radius of R = 0.5 mm. In order to ensure an uninhibited flow of material in the recess 9 during the joining operation, preferably the transition from the counterbore 22 to the die bottom 32 is formed as a convex step 24. In this way it is avoided that flowing material of the die-side component is dammed within the recess 9. This applies equally to the preferred stages 14 and 16 described above. In addition, this convex stage 24 forms a flowing and thereby

barrier-free transition from the die bottom 32 into the annular channel 20 and the countersink 22. This convex step 24 preferably supports a controlled sliding and thus spreading of the Nietfußes the punch rivet during the joining process. For this purpose, a radius R24 of the convex stage 24 in the range of 98/1000 DM <R ₂ 4 <98/100 DM is adjustable. Further preferably, the annular channel portion 10 has a diameter D20, as shown in Fig. 4. By a suitable choice of the diameter D20, the spreading of the Nietfußes is specifically controlled. Thus, the diameter D20 is set according to the head diameter of the punch rivet to be set, so that spreading of the rivet nut in the radial direction beyond the outside of the rivet head is prevented or at least largely restricted. Accordingly, D20 = 7.75 mm in a punch rivet with a head diameter of 7.75 mm or D20 = 5.5 mm in a punch rivet with a head diameter of 5.5 mm.

Further preferably, the circular arc-shaped countersink 22 merges tangentially into the preferably convex steps 16 and 24 which adjoin on both sides. These transition points are designated in FIG. 5 by the reference symbol UP. The radial distance Aup between adjacent transition points UP defines the radial width of the countersink 22. It is preferably in the range 3/100 DM <Aup <20/100 D _M - Another preferred embodiment of the punch rivet die 1 is shown in FIGS. 6 and 7. Here, in comparison with FIG. 5, the countersink 22 has been formed with a larger radius RES and with a greater depth TR.

Figure 8 shows schematically a further preferred embodiment of the present invention, which is described in more detail in Figures 1 1 to 14 by further preferred embodiments. As can be seen in FIG. 8, the counterbore 22 rises radially inwardly to the level of the die bottom 32. In addition to the above-described features of the punch rivet die 1, which apply equally to the embodiments of FIGS. 8 to 14, a central recess 34 is provided in the die base 32. This is arranged symmetrically about the central axis M. This recess 34 absorbs displaced material of the die-side component, thereby avoiding a compression of the punching tool and this is additionally relieved.

For this purpose, a depth TA of the recess 34 is specifically adaptable to the joining task, which is illustrated in analogy to the explanations and illustrations in FIG. 4 with reference to FIG. Preferably, the recess 34 is provided with a depth TA in the range of 2/100 DM <TA <8/100 DM and a preferred diameter DA in the range of 15/100 DM <D _A <35/100 DM. The diameter DA is preferably determined at the level of the die bottom 32. According to FIG. 10, it is further preferred to use the recess 34 in a different shape for influencing the material flow within the recess 9. Accordingly, preferably, the recess 34 is cylindrically shaped (a). In a further preferred embodiment, the cylindrically shaped recess 34 tapers in the depth (d) or is truncated cone-shaped (e). According to a further preferred embodiment, a bottom of the recess 34 is configured with a circumferential annular channel and a central elevation (b) or only with a central elevation (c). Initially, irrespective of the shaping of the recess 34, this facilitates a simpler material displacement in and / or out of the joining region in the form of a material receptacle in comparison to a material displacement radially outward relative to the joining direction of the punched rivet. In order to be able to use this function effectively, the depth TA of the recess is adapted to a thickness of the die-side material layer. For this purpose, the relationship applies, with increasing thickness of the matrix-side material layer is also a suitably greater depth TA of the recess used. With respect to the annular channel discussed above, the general relationship applies with decreasing ductility

Figure 15 shows another preferred embodiment of the present invention. This punch rivet die 1 'is characterized by the following features with respect to the schematic cross section shown in FIG. The Entformungsschräge 12 'of the demolding section 10' includes with the top 8 'of the punch rivet Γ an angle o' in the range of 10 ° <<x '<85 °. The Entformungsschräge 12 'goes radially inward in a circular arc-shaped depression 22' of the annular channel portion 20 'with a radius Rs' in a range of 1/100 DM <Rs'<7/100 DM over. In addition, radially inwardly, the circular-arc-shaped depression 22 'rises in a circular arc shape relative to the die base 32 via at least one first step 36. Due to the specific combination of the annular channel section 20 'and the stepwise rise of the die bottom or the rise from the depression 22' to the highest point of the die bottom 32 *, a stronger lateral spreading of the rivet foot is achieved in addition to a uniform material flow to reduce cracking. This increased spreading achieves a larger undercut against the joining direction of the set punched rivet. Since the connection of the components is not weakened by cracking and also the reinforced undercut promotes the life of the compound and its strength, this Stanznietgeometrie leads to increased connection quality. According to different preferred embodiments of the preferred Stanznietmatrize 1 ', the die bottom 32' has a centrally arranged rotationally symmetrical elevation 40. This is preferably designed for selective spreading of the punched rivet and for increasing the undercut curvilinear or arcuate or semi-elliptical or cylindrical.

FIG. 16 schematically shows a known setting tool in combination with the punch rivet die 1 according to the invention; Γ. By way of example, compounds made therewith are shown using the whip images in FIG. FIG. 17 a shows a punched-rivet connection which has been produced with a punch rivet die 1 according to FIG. FIG. 17b shows the closing head of this connection. FIG. 17 c shows a punched rivet connection which has been produced with a punched rivet die 1 with a central cutout 34. The

Closing head of the connection, Figure 1 shows 7d. FIG. 18 shows the micrograph of a connection made with the punch rivet die Γ according to FIG.

Exemplary template geometries preferred according to the invention are described below on the basis of specific geometry data of punch rivet matrices discussed above. For the classification of the female mold in combination with the following geometric data, reference is made to the figures discussed above:

example 1

A die form similar to FIG. 3 with the following geometry data

D ^~ 12.2 mm

D _{2 (} f = 8.395 mm

oc = 18 °

T _RK = 0.9 mm

Example 2

A die form similar to FIG. 3 with the following geometry data

o = 1 8 ° R _ES = 10.4 mm

R _s = 0.8 mm

Example 3

A die shape similar to FIG. 9 with the following geometry data

D _M ^" 12.2 mm

D ₂₀ = 8.395 mm

oc = 18 ° R _E s = 10.4 mm

Rs = 0.2 mm

D _A = 3.6 mm

T _A = 0.9 mm

Example 4

A die shape similar to FIG. 9 with the following geometry data

D = 12.2 mm

D ₂ tf = 8.09 mm

oc = 18 °

D _A = 3.6 mm

TA = 0.5 mm Example 5

A Matrizenfomi similar to Figure 9 with the following geometry data

oc = 18 °

Example 6

A matrix form similar to FIG. 9 with the following geometry data

D ₂₀ = 7.28 mm

"= 18 °

Example 7

A matrix form similar to FIG. 9 with the following geometry data

DM = 12.2 mm

D ₂₀ = 7.57 mm

o = 18 °

R _OE = 0.59 mm R _ES = oo executed as inclined straight line

Rs-0.834 mm

T ⁼ 1.3 mm

D _A = 3.5 mm

T _A = 0.7 mm

Example 8

A template shape similar to Fi. 10 e) with the following geometry data

Ü =! 2.2 mm

D ₂ o = 8.18 mm

oc = 18 °

RoE = 0.5 mm

R _ES = oo-► executed as an inclined straight line

Rs = 0.7 mm

R ₂₄ = co-> ■ executed as inclined straight line

D _A = 4.87 mm at the opening side of the recess 34

D _A = 2.86 mm at the bottom of the recess 34

T _A = 0.47 mm Example 9

A Matrizenfonii similar to Fig. 10 e) with the following geometry data

Γ ο = 7.53 mm

o = 18 °

R _ES = oo- executed as inclined straight line

R _s = 0.83 mm

R ₂₄ = oo- * executed as inclined straight line

D _A = 4.94 mm at the opening side of the recess 34 D _A = 2.86 mm at the bottom of the recess 34 T _A = 0.49 mm

LIST OF REFERENCE NUMBERS

1, 1 'punch rivet die

3 basic body

5 die base

7 notch

8 top

9, 9 'recess

10, 10 'demolding section

12, 12 'draft angle

14, 16 convex steps

20 ring channel section

22 lowering

24 convex step

30 die bottom

32 level surface

34 recess

36 step F joining direction

M central axis

UP transition point

T _A depth of the recess

TRI Depth of cut

DM die diameter oc Angle of the draft angle

RES radius of the draft angle

Rs radius of reduction

Claims

claims

1 . A punch rivet die (1) for a setting tool, with which a stamped metal connection can be produced in a plurality of components to form a closing head, which has the following features: a. a base body (3) having an upper side (8) and a depression (9) arranged rotationally symmetrically relative to a central axis (M) of the punch rivet die (1) and having a diameter DM at the upper side (8), b. the recess (8) comprises a radially outer annular demolding section

(10), an adjoining annular channel section (20) and a centrally arranged die base, wherein c. in a cross section of the punching rivet die (1), which runs parallel to the central axis (M) a draft angle (12) of the demolding section (10) with the upper side (8) of the punch rivet die (1) encloses an angle o in the range of 5 ° <c <45 °, c2. the Entformungsschräge (12) radially inwardly via a step (16) in an arcuate countersink (22) of the annular channel portion (20) with a radius R _s in a range of 8.2 / 1000 D _M <Rs <8.2 / 100 D. _M passes and c3. radially inwardly the circular arcuate countersink (22) rises in a straight line or in a circular arc or curvilinear manner towards the matrix bottom (30).

2. Stanznietmatrize (1) according to claim 1, the Entformungsschräge (12) is rectilinear or concave circular arc-shaped with a radius RES in the range of 7/10 DM <RE _S <9/10 D _{M is} formed.

3. Stanznietmatrize (1) according to claim 1 or 2, in which the circular arc-shaped countersink (22) has a maximum depth TRK relative to the top (8) in the range of 6/100 DM <TRK <12/100 DM.

4. Stanznietmatrize (1) according to one of the preceding claims, in which the Entformungsschräge (12) in a convex step (16) in the countersink (22) of the annular channel portion (20) passes.

5. punch rivet (1) according to one of the preceding claims, in which the countersink (22) of the annular channel portion (20) merges in a convex stage in the die bottom (30).

6. Stanznietmatrize (1) according to claim 5 in combination with Patentansprache 4, in which the arcuate countersink (22) in two adjacent transition points merges tangentially into the adjacent convex steps and a radial distance Ayp between the adjacent transition points (UP) a width of the circular arc Reduction (22) of the annular channel portion (20) defined.

7. Stanznietmatrize (1) according to claim 6, in which the width of the circular arc-shaped countersink (22) in the range 3/100 D _M <AUP <20/100 D _M.

A punch rivet die (1) according to any one of the preceding claims, further comprising a central recess in the die bottom with a depth TA in the range of 2/100 DM <TA <8/100 DM and with a preferred diameter DA in the range 15/100 DM <DA <35/100 DM, in particular at the level of the die bottom.

9. punch rivet (1) according to claim 8, the recess (8) is cylindrical or tapers conically in the direction of maximum depth TA.

1 0. Stanznietmatrize (1) for a setting tool, with a punched metal connection in a plurality of components to produce a closing head can be produced, which has the following features: a. a base body (3) with an upper side (8) and a depression (9 ') arranged rotationally symmetrically relative to a central axis M of the punch rivet die (1') and formed on the

Upper side (8) has a diameter DM, b. the recess (9 ') comprises a radially outer annular demolding section (10'), an adjoining annular channel section (20 ') and a centrally arranged die bottom (30'), wherein c. in a cross section of the punching rivet die (1 '), which runs parallel to the central axis M a draft angle (12 ') of the demoulding section (10') with the upper side (8) of the punch rivet die (Γ) encloses an angle o 'in the range of 10 ° ≦ ≦ 85 °, c2. the Entformungsschräge (12 ') radially inwardly in an arcuate countersink (22') of the annular channel portion (20 ') with a radius R's in a range of 1/100 DM <R's <7/100 D _M passes and c3, radially inwardly the ki -Ic-arc-shaped reduction (22 ') via at least a first step (36) circular arc rises to the die bottom.

1 stanznietmatrize (Γ) according to claim 10, the die bottom (32 ") has a centrally arranged rotationally symmetrical elevation (40) which is curvilinear, circular arc, semi-elliptical or cylindrical.

12. Setting device with a Stanznietmatrize (1, 1 ') according to one of claims 1 to 1 1.

1 3. Connection of at least a first component and a second component by means of a punch rivet and a punch rivet die (1; Γ) according to one of the claims 1 to 1 1, so that a closing head characterizing the connection has complementary shape characteristics with respect to the punch rivet die (1). having.

14. A compound according to claim 13, in which the closing head adjacent to the second component consists of a tension-sensitive or brittle material, preferably 7000er aluminum alloys.

A punch riveting method for making a joint in at least a first and a second component using a punch rivet, a setting tool and a punch rivet die (1;) according to any one of claims 1 to 11, comprising the steps of: a. Providing (Sl) the punch rivet die (1; Γ) below a punch of the setting tool, b. Arranging (S2) the first and second components between the punch rivet die (1;) and the punch and c. Setting (S3) of a punch rivet in the first and the second component with simultaneous formation of a closing head, which has complementary to an inner contour of the punch rivet (1; Γ) formed shape features.